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3/2 Pneumatic Interlock Valves (CV3xx Series)


Liquip’s pneumatic interlock valve provides a pneumatic interlock on interlock bars, vapour adaptors or API adaptors.

The CV300 3/2 way pneumatic valve is used to identify that a hose has been connected to an adaptor for either loading, discharge or vapour recovery.

When mounted to GC300 guard bar, it can also form part of the pneumatic circuit to ensure the tank truck brakes are on and the vapour vents are open before product can flow.

Commonly mounted to the GC300 series guard bar, VCM450 vapour adaptor and API490 series adaptor.

Features & Benefits
  • 3 port pneumatic spool valve.
  • Normally closed operation.
  • Air supply to Port 1.
  • Actuated air signal out from Port 2.
  • Exhaust from Port 3.

Recommended products for replacement

    Technical Information

    3 x ¼" BSP ports.

    Operating Pressure
    850 kPa maximum operating pressure.

    Standard Mounting to GC300 guard bar, VCM450 and API490 adaptors typically with M6 screws.


    Ordering Information

    CV300: Air Valve 3 Port with Push Button.

    Associated Equipment

    GC300 Series: Vapour Gates

    VCM450: Vapour Adaptor 4" Camlock.

    API490 Series: API adaptors.

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    CV300 Air Valve 3 Port with Push Button.

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